Practice with an AI tutor
Master system design interviews
scaffld is an interactive playground where you architect real systems on a canvas and get instant, expert feedback from an AI tutor.
Free to start · Sign in to save and resume your attempts.
Design canvas
Client
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API
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Cache
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Database
Nice start! How would your cache handle a sudden spike in reads?
Real interview problems
Work through a curated catalog of system design challenges, from URL shorteners to global-scale feeds.
AI tutor feedback
Get guided, real-time feedback on your architecture as you design — like pairing with a senior engineer.
Track your progress
Pick up right where you left off. Every attempt is saved so you can resume and measure improvement.